feat: Implement MFA authentication, add ride statistics model, and update various services, APIs, and tests across the application.

backend/apps/moderation/signals.py

@@ -13,14 +13,7 @@ Includes:
 
 import logging
 
-from django.conf import settings
-from django.dispatch import receiver, Signal
-
-from apps.core.state_machine.signals import (
-    post_state_transition,
-    state_transition_failed,
-)
-
+from django.dispatch import Signal
 
 logger = logging.getLogger(__name__)
 
@@ -269,6 +262,7 @@ def _update_related_queue_items(instance, status):
     """Update queue items related to a moderation object."""
     try:
         from django.contrib.contenttypes.models import ContentType
+
         from apps.moderation.models import ModerationQueue
 
         content_type = ContentType.objects.get_for_model(type(instance))
@@ -328,10 +322,10 @@ def _finalize_bulk_operation(instance, success):
 def _broadcast_submission_status_change(instance, source, target, user):
     """
     Broadcast submission status change for real-time UI updates.
-    
+
     Emits the submission_status_changed signal with a structured payload
     that can be consumed by notification systems (Novu, SSE, WebSocket, etc.).
-    
+
     Payload format:
     {
         "submission_id": 123,
@@ -344,11 +338,11 @@ def _broadcast_submission_status_change(instance, source, target, user):
     }
     """
     try:
-        from .models import EditSubmission, PhotoSubmission
-        
+        from .models import EditSubmission
+
         # Determine submission type
         submission_type = "edit" if isinstance(instance, EditSubmission) else "photo"
-        
+
         # Build the broadcast payload
         payload = {
             "submission_id": instance.pk,
@@ -359,13 +353,13 @@ def _broadcast_submission_status_change(instance, source, target, user):
             "locked_at": None,
             "changed_by": user.username if user else None,
         }
-        
+
         # Add claim information if available
         if hasattr(instance, 'claimed_by') and instance.claimed_by:
             payload["locked_by"] = instance.claimed_by.username
         if hasattr(instance, 'claimed_at') and instance.claimed_at:
             payload["locked_at"] = instance.claimed_at.isoformat()
-        
+
         # Emit the signal for downstream notification handlers
         submission_status_changed.send(
             sender=type(instance),
@@ -376,7 +370,7 @@ def _broadcast_submission_status_change(instance, source, target, user):
             locked_by=payload["locked_by"],
             payload=payload,
         )
-        
+
         logger.debug(
             f"Broadcast status change: {submission_type}#{instance.pk} "
             f"{source} -> {target}"
@@ -397,11 +391,11 @@ def register_moderation_signal_handlers():
 
     try:
         from apps.moderation.models import (
-            EditSubmission,
-            PhotoSubmission,
-            ModerationReport,
-            ModerationQueue,
             BulkOperation,
+            EditSubmission,
+            ModerationQueue,
+            ModerationReport,
+            PhotoSubmission,
         )
 
         # EditSubmission handlers